Some more info on this paperExcerpts from academic papers on pusher propfan and contra-rotating propeller simulation models. Posted by SOYO on Weibo.
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Core flow of 50kg/s and designed cruise speed of Mach 0.785 at 35000ft
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from a paper associated with AECC Commercial Engines, some kind of propfan with stator vanes in the works similar to CFM RISE.